how to handle in_app_purchase flutter auto renewed subscriptions

Question

I am missing documentation for in_app_purchase behaviour such as:

1. What happens if subscription is auto-renewed a) do I have to restore via PurchaseStatus.restored or new purchases will arrive via PurchaseStatus.purchased
2. If new purchases will arrive via PurchaseStatus.restored on subscription renewal but app is turned off? Will it be triggered upon turning app on?
3. Should I run validate expiration date of all existing subscriptions on every app start?